Open Kanto: the S.S. Aqua, the Kanto gyms, the Magnet Train, Mt. Silver and Red (Closes #33)
All 146 Kanto maps, Route 22, Route 28 and Silver Cave are open. The Magnet Train, Snorlax and the Poké Flute channel, the Diploma, the Trainer House, Bill's grandpa, Oak's Pokédex rating in Pallet and Goldenrod's postgame move tutor are ported; big objects cover 2x2 tiles. The Magnet Train and the Diploma are compared with the cartridge frame by frame. The playthrough continues from the Hall of Fame through the S.S. Aqua, the eight Kanto badges, Oak opening Mt. Silver and Red's defeat and credits. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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import { describe, expect, it } from "vitest";
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import { existsSync, readFileSync } from "node:fs";
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import { CrystalAssets } from "../src/game/rom/assets";
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import { GameWorld } from "../src/game/world/world";
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import { generatePartyMon } from "../src/game/party/pokemon";
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import { snorlaxAwake } from "../src/game/scripts/kanto";
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import { TEARDOWN_FRAMES } from "../src/game/scripts/magnet-train";
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import { SOUND } from "../src/game/audio/constants";
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import { settle } from "./world-driver";
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const romPath =
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process.env.CRYSTAL_ROM_PATH ?? "Pokemon - Crystal Version (UE) (V1.1) [C][!].gbc";
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describe.skipIf(!existsSync(romPath))("Kanto with the local ROM", () => {
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const bytes = existsSync(romPath) ? new Uint8Array(readFileSync(romPath)) : new Uint8Array();
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const VERMILION = "12:3",
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BILLS_HOUSE = "7:11",
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TRAINER_HOUSE_B1F = "23:7",
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SAFFRON_STATION = "25:9",
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GOLDENROD_STATION = "11:7",
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CELADON_MANSION_3F = "21:14",
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OAKS_LAB = "13:6",
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GOLDENROD = "11:2",
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MOUNT_MOON = "3:85",
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INDIGO_PLATEAU_CENTER = "16:2";
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const LICKITUNG = 108,
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EVERSTONE = 0x70,
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PASS = 0x86,
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EVENT_GOT_EVERSTONE_FROM_BILLS_GRANDPA = 0x320,
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EVENT_SHOWED_LICKITUNG_TO_BILLS_GRANDPA = 0x31b,
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EVENT_ENABLE_DIPLOMA_PRINTING = 0xd6,
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EVENT_RESTORED_POWER_TO_KANTO = 0xcd,
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EVENT_OPENED_MT_SILVER = 0x74f,
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EVENT_TALKED_TO_OAK_IN_KANTO = 0xe1,
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EVENT_BEAT_ELITE_FOUR = 0x44,
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COIN_CASE = 0x36,
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PIKACHU = 25,
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THUNDERBOLT = 85,
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ENGINE_DAILY_MOVE_TUTOR = 94,
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EVENT_BEAT_RIVAL_IN_MT_MOON = 0x319;
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const world = (date = "2026-09-22T12:00:00") => {
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let seed = 33;
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const game = new GameWorld(
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new CrystalAssets(bytes),
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() => new Date(date),
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() => {
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seed = (seed * 1103515245 + 12345) >>> 0;
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return (seed >>> 16) & 255;
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},
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);
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game.state.party = [mon(game, 157, 60)];
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return game;
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};
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const mon = (game: GameWorld, species: number, level = 30) =>
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generatePartyMon(game.assets.pokemon, {
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species,
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level,
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item: 0,
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otId: game.playerId,
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ot: "KAWA",
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dvs: 0x8888,
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caughtData: 0,
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});
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/** Stand at (x, y) on `map` facing `face`, press A and answer. */
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const talk = (
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game: GameWorld,
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map: string,
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x: number,
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y: number,
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face: "up" | "down" | "left" | "right",
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answers: (number | string)[] = [],
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) => {
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game.warpTo(map, x, y);
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settle(game);
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game.restore({ ...game.save(), x, y, direction: face });
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game.interact();
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const shown = settle(game, answers).join(" ");
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expect(game.notice, game.diagnostic).toBe("");
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return shown;
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};
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/** Run scripts until a battle starts, answering questions with YES. */
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const untilBattle = (game: GameWorld) => {
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const shown: string[] = [];
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for (let tick = 0; tick < 3000 && !game.battle; tick++) {
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expect(game.notice, game.diagnostic).toBe("");
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const dialogue = game.dialogue;
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if (dialogue) {
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const last = dialogue.index === dialogue.pages.length - 1;
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if (!shown.includes(dialogue.pages[dialogue.index])) shown.push(dialogue.pages[dialogue.index]);
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if (last && dialogue.choice) game.choose(1);
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else if (last && dialogue.holdTicks !== undefined) game.tick();
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else game.advanceDialogue();
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} else game.tick();
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}
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return shown.join(" ");
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};
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/** Run a screen that plays on its own to its end, counting its frames. */
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const watch = (game: GameWorld) => {
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let frames = 0;
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for (let tick = 0; tick < 2000 && game.dialogue?.choice?.kind === "screen"; tick++) {
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frames += 2;
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game.tick();
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}
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return frames;
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};
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describe("Vermilion's Snorlax", () => {
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it("wakes only to the Poké Flute channel, from beside it", () => {
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const r = new CrystalAssets(bytes).reader;
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const flute = SOUND.MUSIC_POKE_FLUTE_CHANNEL;
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for (const [x, y] of [[33, 8], [34, 10], [35, 10], [36, 8], [36, 9]])
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expect(snorlaxAwake(r, flute, { x, y })).toBe(1);
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expect(snorlaxAwake(r, flute, { x: 34, y: 11 })).toBe(0);
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expect(snorlaxAwake(r, SOUND.MUSIC_NONE, { x: 34, y: 10 })).toBe(0);
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});
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it("covers two tiles by two and snores until the flute plays", () => {
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const game = world();
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// The big Snorlax at (34, 8) also fills (35, 9): no step there.
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game.warpTo(VERMILION, 36, 9);
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settle(game);
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game.restore({ ...game.save(), x: 36, y: 9, direction: "left" });
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game.move("left");
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settle(game);
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expect({ x: game.x, y: game.y }).toEqual({ x: 36, y: 9 });
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expect(talk(game, VERMILION, 34, 10, "up")).toContain("SNORLAX is snoring\npeacefully…");
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// The Pokégear's radio left on the Poké Flute channel (wMapMusic).
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game.restore({ ...game.save(), x: 34, y: 10, direction: "up" });
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game.sound.engine.mapMusic = SOUND.MUSIC_POKE_FLUTE_CHANNEL;
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game.interact();
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expect(untilBattle(game)).toContain("SNORLAX");
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expect(game.battle?.engine.enemy.mon.species).toBe(143);
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expect(game.battle?.engine.enemy.mon.level).toBe(50);
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});
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});
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it("has Bill's grandpa take a look at a Lickitung for the Everstone", () => {
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const game = world();
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game.state.party.push(mon(game, LICKITUNG));
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// YES to show him, then the party's second Pokémon.
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const shown = talk(game, BILLS_HOUSE, 2, 4, "up", [1, 1]);
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expect(shown).toContain("Hm? You know BILL?");
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expect(shown).toContain("LICKITUNG");
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expect(game.state.events.has(EVENT_SHOWED_LICKITUNG_TO_BILLS_GRANDPA)).toBe(true);
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expect(game.state.events.has(EVENT_GOT_EVERSTONE_FROM_BILLS_GRANDPA)).toBe(true);
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expect(game.state.bag.items.some((slot) => slot.item === EVERSTONE)).toBe(true);
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});
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it("matches the Trainer House's default trainer, CAL", () => {
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const game = world();
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// The receptionist's coordinate event at (7, 3), from the stairs' side.
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game.warpTo(TRAINER_HOUSE_B1F, 8, 3);
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settle(game);
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game.restore({ ...game.save(), x: 8, y: 3, direction: "left" });
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expect(game.move("left")).toBe(true);
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// TrainerHouse returns 0 without a Mystery Gift partner: CAL3.
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expect(untilBattle(game)).toContain("CAL");
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expect(game.battle?.engine.enemy.mon).toBeDefined();
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});
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it("rides the Magnet Train both ways with the PASS once the power is back", () => {
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const game = world();
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game.state.bag.keyItems.push(PASS);
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game.state.events.add(EVENT_RESTORED_POWER_TO_KANTO);
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// Saffron's officer at (9, 9): YES, then the ride to Goldenrod.
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game.warpTo(SAFFRON_STATION, 9, 10);
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settle(game);
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game.restore({ ...game.save(), x: 9, y: 10, direction: "up" });
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game.interact();
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for (let tick = 0; tick < 400 && game.dialogue?.choice?.kind !== "screen"; tick++) {
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if (game.dialogue?.choice) game.choose(1);
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else if (game.dialogue) game.advanceDialogue();
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else game.tick();
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}
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expect(game.dialogue?.choice?.kind).toBe("screen");
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const frames = watch(game);
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// The first run through, its palette frame, the ride and the teardown.
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expect(frames).toBeGreaterThan(300 + TEARDOWN_FRAMES);
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settle(game);
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expect(game.notice, game.diagnostic).toBe("");
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expect(game.mapId).toBe(GOLDENROD_STATION);
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// And back from Goldenrod's officer.
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game.restore({ ...game.save(), x: 9, y: 10, direction: "up" });
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game.interact();
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for (let tick = 0; tick < 400 && game.dialogue?.choice?.kind !== "screen"; tick++) {
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if (game.dialogue?.choice) game.choose(1);
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else if (game.dialogue) game.advanceDialogue();
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else game.tick();
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}
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watch(game);
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settle(game);
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expect(game.mapId).toBe(SAFFRON_STATION);
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});
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it("shows the Diploma for a complete Pokédex, then cannot print it", () => {
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const game = world();
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for (let species = 1; species <= 251; species++) {
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game.state.pokedex.seen.add(species);
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game.state.pokedex.caught.add(species);
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}
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// The game designer at (3, 6), from below.
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game.warpTo(CELADON_MANSION_3F, 3, 7);
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settle(game);
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game.restore({ ...game.save(), x: 3, y: 7, direction: "up" });
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game.interact();
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let diploma = "";
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for (let tick = 0; tick < 400; tick++) {
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const choice = game.dialogue?.choice;
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if (choice?.kind === "screen") {
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diploma = choice.screen.label;
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game.choose("a");
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break;
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}
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if (game.dialogue) game.advanceDialogue();
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else game.tick();
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}
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expect(diploma).toBe(`Diploma: ${game.name}`);
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settle(game);
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expect(game.state.events.has(EVENT_ENABLE_DIPLOMA_PRINTING)).toBe(true);
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// The graphic artist at (3, 4) prints it: no printer, B cancels.
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game.restore({ ...game.save(), x: 3, y: 5, direction: "up" });
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game.interact();
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let printer = "";
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for (let tick = 0; tick < 400; tick++) {
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const choice = game.dialogue?.choice;
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if (choice?.kind === "yesno") game.choose(1);
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else if (choice?.kind === "screen") {
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printer = choice.screen.label;
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game.choose("b");
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break;
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} else if (game.dialogue) game.advanceDialogue();
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else game.tick();
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}
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expect(printer).toMatch(/B/);
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settle(game);
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expect(game.notice, game.diagnostic).toBe("");
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});
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it("has Professor Oak open Mt. Silver for sixteen badges and rate the Pokédex", () => {
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const game = world();
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for (let badge = 0x1b; badge < 0x1b + 16; badge++) game.state.flags.add(badge);
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for (const species of [1, 4, 7, 25]) game.state.pokedex.seen.add(species);
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game.state.pokedex.caught.add(25);
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// Oak at (4, 2), from below.
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const shown = talk(game, OAKS_LAB, 4, 3, "up");
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expect(game.state.events.has(EVENT_TALKED_TO_OAK_IN_KANTO)).toBe(true);
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expect(game.state.events.has(EVENT_OPENED_MT_SILVER)).toBe(true);
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expect(shown).toContain("4 POKéMON seen\n1 POKéMON owned");
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expect(shown).toContain("Look for POKéMON\nin grassy areas!");
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});
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it("has Goldenrod's move tutor teach Thunderbolt for 4000 coins on a Wednesday after the League", () => {
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// 2026-09-23 is a Wednesday.
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const game = world("2026-09-23T12:00:00");
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game.state.party.push(mon(game, PIKACHU, 5));
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game.state.events.add(EVENT_BEAT_ELITE_FOUR);
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game.state.bag.keyItems.push(COIN_CASE);
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game.state.coins = 5000;
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// The tutor at (12, 22), from below.
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game.warpTo(GOLDENROD, 12, 23);
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settle(game);
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expect(game.objects().some((object) => object.x === 12 && object.y === 22)).toBe(true);
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game.restore({ ...game.save(), x: 12, y: 23, direction: "up" });
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game.interact();
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// YES, YES to 4000 coins, THUNDERBOLT, then Typhlosion (NOT ABLE:
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// back to the menu) and Pikachu.
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const party = [0, 1],
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details: string[][] = [];
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for (let tick = 0; tick < 3000 && game.busy; tick++) {
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expect(game.notice, game.diagnostic).toBe("");
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const dialogue = game.dialogue;
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const last = dialogue && dialogue.index === dialogue.pages.length - 1;
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if (last && dialogue.choice?.kind === "yesno") game.choose(1);
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else if (last && dialogue.choice?.kind === "menu" && dialogue.choice.items.includes("THUNDERBOLT"))
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game.choose(dialogue.choice.items.indexOf("THUNDERBOLT"));
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else if (last && dialogue.choice?.kind === "menu") {
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details.push(dialogue.choice.details ?? []);
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game.choose(party.shift()!);
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} else if (dialogue) game.advanceDialogue();
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else game.tick();
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}
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expect(details).toEqual([
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["NOT ABLE", "ABLE"],
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["NOT ABLE", "ABLE"],
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]);
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const pikachu = game.state.party[1];
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expect(pikachu.moves).toContain(THUNDERBOLT);
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expect(game.state.coins).toBe(1000);
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expect(game.state.flags.has(ENGINE_DAILY_MOVE_TUTOR)).toBe(true);
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// Into the Game Corner: gone from the street.
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expect(game.objects().some((object) => object.x === 12 && object.y === 22)).toBe(false);
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});
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describe("the rival in Kanto", () => {
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it("waits in Mt. Moon", () => {
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const game = world();
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// MountMoonRivalEncounterScene, from the Route 3 entrance.
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game.warpTo(MOUNT_MOON, 3, 3);
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expect(untilBattle(game)).toContain(`It's been a while,\n${game.name}.`);
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expect(game.battle).toBeDefined();
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});
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// PlateauRivalBattle1 and 2: Mondays and Wednesdays, after Mt. Moon.
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for (const [date, day, fights] of [
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["2026-09-21T12:00:00", "a Monday", true],
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["2026-09-22T12:00:00", "a Tuesday", false],
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] as const)
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it(`${fights ? "battles" : "stays away"} at Indigo Plateau on ${day}`, () => {
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const game = world(date);
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game.state.events.add(EVENT_BEAT_RIVAL_IN_MT_MOON);
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game.warpTo(INDIGO_PLATEAU_CENTER, 16, 5);
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settle(game);
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game.restore({ ...game.save(), x: 16, y: 5, direction: "up" });
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expect(game.move("up")).toBe(true);
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if (fights) {
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expect(untilBattle(game)).toContain("Hold it.");
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expect(game.battle).toBeDefined();
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} else {
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settle(game);
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expect(game.battle).toBeUndefined();
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expect({ x: game.x, y: game.y }).toEqual({ x: 16, y: 4 });
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}
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});
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});
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});
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Reference in new issue
Block a user